Authentik is an open-source Identity Provider focused on flexibility and versatility. You can use Authentik in an existing environment to add support for new protocols, implement sign-up/recovery/etc. in your application so you don't have to deal with it, and many other things.

Audiobookshelf is a self-hosted audiobook server for managing and playing your audiobooks.

Calibre-Web is a web app providing a clean interface for browsing, reading and downloading eBooks using an existing Calibre database.

Emby (formerly Media Browser) is a media server designed to organize, play, and stream audio and video to a variety of devices.

As the name suggests Heimdall Application Dashboard is a dashboard for all your web applications. It doesn't need to be limited to applications though, you can add links to anything you like. Heimdall is an elegant solution to organise all your web applications. It’s dedicated to this purpose so you won’t lose your links in a sea of bookmarks. Why not use it as your browser start page? It even has the ability to include a search bar using either Google, Bing or DuckDuckGo.